Letters to the Editor
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Even if he let her in, it's okay for both to show her the door.
I still think there's room for telling her to back off.
Yes the boyfriend is the one who didn't draw boundaries and even invited the attention, so he's the one who needs to reinforce them. If he's finding this difficult it's because allowing someone to cross the line is a passive act, but getting them to back off requires direct confrontation. When you're passively letting someone come on to you, everyone can pretend nothings going on - when you have to actively reject them, it then becomes hard to tell the stalker to stop what hasn't been acknowledged.
So she may be baiting the girlfriend to come between them and now refusing to get the message until it is explicit. In the former case, it is proper for the letter writer to let her know she isn't welcome, if he's made aware of the problem and will back her up. Then she isn't in the position of wronged woman, but part of a couple ditching an unwanted intruder.
If the professional relationship is a concern there are professional, and if necessary, legal ways to impose limits.